Need a much better picture, one that has some light on the coin (turn on the lights) I'd hazard a guess that it's either acid damaged or a trivial Misaligned Die (MAD)
I can see a number of parallel striations running SW - NE on the obverse, could be an annealing issue @paddyman98
Looks like a heavily corroded (verdigris) coin that was whizzed clean on a wire wheel. There seems to be lots of green spots still remaining on it. Look at the g in god.